2004/06/17 by F. K. Hansen, Frode K. Hansen, Hansen, F. K.
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Radio Astronomy Observations and Technology #Relativity and Gravitational Theory #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0406393
4 pages, to appear in the proceedings of the XXXIX Rencontres de Moriond "Exploring the Universe", La Thuile, Italy, March 28 - April 4, 2004
arxiv created 2004/06/17 · openalex publication_date 2004/06/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
There have recently been several claims of an asymmetric distribution of large scale fluctuations in the WMAP data. I review some recent results from a test of isotropy of the power spectrum at all scales and show how the power is asymmetrically distributed for the multipole range l=5-40 in three WMAP frequency channels. I compare this to a recent detection of a non-Gaussian signal in one part of the sky using the local curvature properties of the cosmic microwave background fluctuation field. I find that there may be a common origin of these two findings due to a similar direction and frequency independence of the results.